OTT HydroMet

- Model PLS - Pressure Level Sensor

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The OTT PLS measures water level, depth to water, or pressure by means of an integrated controller and ceramic pressure-measuring cell. Design features such as multiple communication outputs (SDI-12 or 4 ... 20 mA), stainless steel housing, and a rugged cable make this sensor ideal for monitoring water level in a variety of applications.

  • Application: Surface water, Groundwater
  • Measurement technology: Vented pressure cell
  • Parameters measured: Water level, Pressure, Temperature
  • Product Highlights: Water level and temperature measurement - for use with external data logger
  • Measurement range: 0 … 4, 10, 20, 40, and 100 m
  • Accuracy: ± 0.05% FS
  • Internal data logger: Yes
  • Interface: SDI-12, RS-485 (using SDI-12), or 4 … 20 mA

  • The robust ceramic pressure cell offers industry-leading accuracy and does not deform over time like membrane technology, providing long-term measurement stability
  • Rugged design: Ceramic pressure cell resistant to physical force (5 x burst pressure) and enclosure made of high-quality saltwater resistant steel for use in coastal environments
  • Built-in microcontroller – compensates for temperature effects and applies correction values for gravitational acceleration and water density
  • Vented pressure probe, automatically compensates for changes in barometric pressure
  • Robust cable with Kevlar core for length stabilization and capillary tube for venting
  • Simple setup and connection to external dataloggers using SDI-12 or 4 ... 20 mA interfaces
  • Optimized resolution is achieved by assigning the 4 ... 20 mA to that part of the measuring range that is actually required
  • Water temperature output in addition to water level (for SDI-12 output)

Measuring water level in surface and groundwater, including:

  • Stations with sloping bottom, e.g. water banks
  • Small diameter pipes or holes (from 1' Ø)
  • Dams, weirs, irrigation systems
  • Waterways that occasionally ice over
  • Brackish water, saltwater
  • Waterways that do not contain water throughout the year (e.g. retaining basins)

  • Water level measurement:
    • Measurement range: 0 ... 4 m, 10 m, 20 m, 40 m, 100 m
  • Accuracy:
    • SDI-12: ±0.05 % FS (linearity and hysteresis)
    • 4 ... 20 mA: ±0.1 % FS (linearity and hysteresis)
    • 10 ppm/°C at 20 °C
    • Resolution (SDI-12): 0.001 m; 0.1 cm; 0.01 ft; 0.1 mbar; 0.001 psi
    • Temperature compensated working range:  -5 °C ... +45 °C (ice-free)
  • Temperature measurement range: –-25 °C ... +70 °C (ice-free)
    • Resolution: 0.1 °C / 0.1 °F
    • Accuracy: ±0.5 °C / ±0.9 °F
  • Electrical Data:
    • Available interfaces (use as required): 4 ... 20 mA, SDI-12, RS485 (via SDI-12 protocol)
    • Supply voltage: +9.6 ... +28 V DC, typically 12/24 V DC
  • Power consumption (SDI-12):
    • Sleep:
    • Active:
  • Pressure sensor: (capacitive pressure sensor) ceramic, temperature compensated, overload safe for up to 5 times the measuring range without permanent mechanical damage
  • Temperature sensor: NTC
  • Dimensions: 195 mm x 22 mm
  • Weight: approx. 0.3 kg
  • Environmental conditions:
    • Operating temperature: –-25 ... +70 °C
    • Storage temperature: –-40 ... +85 °C
  • Materials:
    • Housing: stainless steel 1.4539 (904L) resistant to sea water
    • Seals: Viton
    • Cable jacket: PUR
    • Protection type: IP68
    • Mechanical Strength: meets the mechanical shock tests of IEC 68-2-32
  • EMC Limits: CE conformity; EN 61000-4-2/3/4/5/6 and EN 61000-6-3 Class B are adhered to.

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